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Director/barycentric rotation in cholesteric droplets under temperature gradient.

Jun Yoshioka1, Fumiya Ito, Yuto Suzuki

  • 1Faculty of Science and Engineering, Waseda University, Tokyo, Japan. j-yoshioka@aoni.waseda.jp.

Soft Matter
|May 29, 2014
PubMed
Summary
This summary is machine-generated.

This study reveals two distinct rotational modes in chiral liquid crystal droplets driven by heat currents, a phenomenon known as the Lehmann effect. The direction of the heat current relative to the droplet

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Area of Science:

  • Liquid Crystal Physics
  • Soft Matter Science
  • Thermodynamics

Background:

  • The Lehmann effect describes unidirectional molecular motion in chiral liquid crystals under electric current.
  • This study investigates a heat-current-driven variant of the Lehmann effect in cholesteric liquid crystal droplets.
  • Cholesteric droplets exhibit unique helical structures and surface properties, influencing their response to external stimuli.

Purpose of the Study:

  • To investigate the heat-current-driven Lehmann effect in two types of hemispherical cholesteric droplets.
  • To analyze the influence of helical axis orientation relative to the heat current on droplet rotation.
  • To understand the underlying torques and their dependence on chirality and droplet size.

Main Methods:

  • Utilized polarizing, reflecting, confocal, and fluorescent microscopy.
  • Studied two types of hemispherical cholesteric droplets with different helical axis orientations (parallel and perpendicular to the substrate).
  • Applied a temperature gradient perpendicular to the substrate.

Main Results:

  • Observed two distinct rotational modes: pure director rotation (helical axis parallel to heat current) and rigid-body rotation (helical axis perpendicular to heat current).
  • Demonstrated that these rotational modes can be switched by altering the heat current direction relative to the helical axis.
  • Found differing dependencies of rotational efficiency on chirality strength and droplet size for each mode, suggesting distinct torque origins.

Conclusions:

  • This is the first observation of heat-current-induced pure director rotation and molecular barycentric motion in cholesteric droplets.
  • The orientation of the helical axis relative to the heat current is crucial in determining the rotational mode.
  • The findings suggest independent torques drive the observed rotational behaviors, offering new insights into liquid crystal dynamics.